Patentable/Patents/US-8836679
US-8836679

Display with multiplexer feed-through compensation and methods of driving same

PublishedSeptember 16, 2014
Assigneenot available in USPTO data we have
Inventorsnot available in USPTO data we have
Technical Abstract

In one aspect, an LCD includes a display panel with a pixel matrix having M scan lines and N data lines, and a multiplexer feed-through compensation circuit, which includes P signal lines for providing P video signals, P multiplexers, and K pairs of control lines providing K pairs of control signals. Each multiplexer is electrically coupled to a corresponding signal line and has K channels. Each channel includes first and second switches parallel-connected between the signal line and a corresponding data line for selectively transmitting the video signal to the corresponding data line. Each pair of control lines is respectively electrically coupled to the first and second switches of a corresponding channel of each multiplexer. Each pair of control signals are configured such that a time turning off one of the first and second switches is earlier than that turning off the other switch.

Patent Claims
8 claims

Legal claims defining the scope of protection, as filed with the USPTO.

1

1. A display, comprising: (a) a display panel having a plurality of pixels arranged in a matrix having M pixel rows and N pixel columns, M scan lines electrically coupled to M pixel rows, respectively, and N data lines electrically coupled to N pixel columns, respectively, wherein M and N are integers greater than one; (b) P signal lines for providing P video signals, wherein P is an integer greater than one; (c) P multiplexers, wherein each multiplexer has an input electrically coupled to a corresponding signal line for receiving a corresponding video signal therefrom, and K channels, each channel comprising a first switch and a second switch parallel-connected between the input and a corresponding data line, for selectively transmitting the video signals, to the corresponding data line, wherein K is an integer greater than one; and (d) K pairs of control lines for providing K pairs of control signals, respectively, wherein each pair of control lines is respectively and electrically coupled to the first and second switches of a corresponding channel of each multiplexer for providing a corresponding pair of control signals for turning on or off the first and second switches thereof, thereby selectively transmitting the video signal to the corresponding data line, wherein each pair of control signals are configured such that a time turning off one of the first and second switches is earlier than that turning off the other of the first and second switches, wherein each of each pair of control signals has a waveform defined by a low voltage, a high voltage, a rising edge from the low voltage to the high voltage at a rising time, and a falling edge from the high voltage to the low voltage at a falling time, in a period, wherein for each control signal, the rising time is the time turning on a corresponding switch, and the falling time is the time turning off the corresponding switch, and wherein for each control signal, the rising time is earlier than the falling time; and wherein for each pair of control signals, the falling time of the second control signal is later than the falling time of the first control signal, and the rising time of the second control signal is one of same as the falling time of the first control signal, later than the rising time but earlier than the falling time of the first control signal, and earlier than the rising time of the first control signal.

2

2. The display of claim 1 , wherein P*K=N.

3

3. The display of claim 1 , wherein each of the first and second switches of each channel of each multiplexer has a channel width, wherein the channel width of the first switch is identical to or different from that of the second switch.

4

4. The display of claim 1 , wherein each of the first and second switches of each channel of each multiplexer comprises a transistor having a gate, a source and a drain, wherein the gate, the source and the drain of the first switch are electrically coupled to the first control signal of the pair of control signals, the input of the multiplexer, and the corresponding data line, respectively, and wherein the gate, the source and the drain of the second switch are electrically coupled to the second control signal of the pair of control signals, the source of the first switch and the drain of the first switch, respectively.

5

5. A multiplexer circuit for a display panel, wherein the display panel has a plurality of pixels arranged in a matrix having M pixel rows and N pixel columns, M scan lines electrically coupled to M pixel rows, respectively, and N data lines electrically coupled to N pixel columns, respectively, wherein M and N are integers greater than one, comprising: (a) P multiplexers, wherein each multiplexer has an input electrically coupled to a corresponding signal line for receiving a corresponding video signal therefrom, and K channels, each channel comprising a first switch and a second switch parallel-connected between the input and a corresponding data line, for selectively transmitting the video signal to the corresponding data line, wherein P and K are integers greater than one; and (b) K pairs of control lines for providing K pairs of control signals, respectively, wherein each pair of control lines is respectively and electrically coupled to the first and second switches of a corresponding channel of each multiplexer for providing a corresponding pair of control signals for turning on or off the first and second switches thereof, thereby selectively transmitting the video signal to the corresponding data line, wherein each pair of control signals are configured such that a time turning off one of the first and second switches is earlier than that turning off the other of the first and second switches, wherein each of each pair of control signals has a waveform defined by a low voltage, a high voltage, a rising edge from the low voltage to the high voltage at a rising time, and a falling edge from the high voltage to the low voltage at a falling time, in a period, wherein for each control signal, the rising time is the time turning on a corresponding switch, and the falling time is the time turning off the corresponding switch, and wherein for each control signal, the rising time is earlier than the falling time; and wherein for each pair of control signals, the falling time of the second control signal is later than the falling time of the first control signal, and the rising time of the second control signal is one of same as the falling time of the first control signal, later than the rising time but earlier than the falling time of the first control signal, and earlier than the rising time of the first control signal.

6

6. The multiplexer circuit of claim 5 , wherein each of the first and second switches of each channel of each multiplexer comprises a transistor having a gate, a source and a drain, wherein the gate, the source and the drain of the first switch are electrically coupled to the first control signal of the pair of control signals, the input of the multiplexer, and the corresponding data line, respectively, and wherein the gate, the source and the drain of the second switch are electrically coupled to the second control signal of the pair of control signals, the source of the first switch and the drain of the first switch, respectively.

7

7. A method for driving a display panel, wherein the display panel has a plurality of pixels arranged in a matrix having M pixel rows and N pixel columns, M scan lines electrically coupled to M pixel rows, respectively, and N data lines electrically coupled to N pixel columns, respectively, wherein M and N are integers greater than one, comprising the steps of: (a) providing a multiplexer circuit comprising: P multiplexers, wherein each multiplexer has an input electrically coupled to a corresponding signal line for receiving a corresponding video signal therefrom, and K channels, each channel comprising a first switch and a second switch parallel-connected between the input and a corresponding data line, for selectively transmitting the video signal line to the corresponding data line, wherein P and K are integers greater than one; and K pairs of control lines, wherein each pair of control lines is respectively and electrically coupled to the first and second switches of a corresponding channel of each multiplexer; and (b) applying K pairs of control signals to the K pairs of control lines, respectively, such that each pair of control signals is respectively and electrically coupled to the first and second switches of the corresponding channel of each multiplexer for turning on or off the first and second switches thereof, thereby selectively transmitting the video signal to the corresponding data line, wherein each pair of control signals are configured such that a time turning off one of the first and second switches is earlier than that turning off the other of the first and second switches, wherein each of each pair of control signals has a waveform defined by a low voltage, a high voltage, a rising edge from the low voltage to the high voltage at a rising time, and a falling edge from the high voltage to the low voltage at a falling time, in a period, wherein for each control signal, the rising time is the time turning on a corresponding switch, and the falling time is the time turning off the corresponding switch, and wherein for each control signal, the rising time is earlier than the falling time; and wherein for each pair of control signals, the falling time of the second control signal is later than the falling time of the first control signal, and the rising time of the second control signal is one of same as the falling time of the first control signal, later than the rising time but earlier than the falling time of the first control signal, and earlier than the rising time of the first control signal.

8

8. The method of claim 7 , wherein each of the pair of control signals has a waveform defined by a low voltage, a high voltage, a rising edge from the low voltage to the high voltage at a rising time, and a falling edge from the high voltage to the low voltage at a falling time in a period, wherein for each control signal, the rising time is the time turning on a corresponding switch, and the falling time is the time turning off the corresponding switch, and wherein for each control signal, the rising time is earlier than the falling time.

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Patent Metadata

Filing Date

August 6, 2012

Publication Date

September 16, 2014

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